An electroscope is a device which is used to find if an object is

1

(a)

charged

(b)

magnetic

(c)

free of cracks

(d)

hot

The movement of the earth's plates causes

1

(a)

cyclones

(b)

lightning

(c)

earthquake

(d)

thunderstorms

The earth's plate responsible for causing earthquake is

1

(a)

the crust of the earth

(b)

the mantle of the earth

(c)

the inner core of the earth

(d)

the outer core of the earth

Where is the lightning rod attached to protect the building from lightning?

1

(a)

On the top of building

(b)

In the middle of building

(c)

On the bottom of building

(d)

All of the above

Major earthquakes are less likely to occur in

1

(a)

North-East India

(b)

Rajasthan

(c)

Rann of Kutch

(d)

Orissa

Nitrogen fixation occurs during ___________.

1

(a)

lightning

Earthquake is caused by _____________ a deep inside the earth's crust.

1

(a)

disturbance

Seismograph is an instrument that records _____________.

1

(a)

seismic waves

It is ____________ possible to predict the occurrence of an _____________.

1

(a)

not, earthquake

Earthquakes are caused due to movements of _____________.

1

(a)

earth's plate

The process of electric discharge cannot occur between clouds and the earth.

1

(a) True

(b) False

Bathing outdoors should be avoided during thunderstorm.

1

(a) False

(b) True

We should build heavy houses in a danger zone.

1

(a) True

(b) False

Mantle is the outermost layer of the earth.

1

(a) True

(b) False

Earthquake can be predicted in advance.

1

(a) True

(b) False

Explain the importance of earthing.

2

(a)

In order to protect the building from lightning, briefly mention the place, where is the lightning rod should be attached.

2

(a)

What do you mean by earthing?

2

(a)

What are seismic or fault zones?

2

(a)

Boojho: My grandmother told me that the earth is balanced on the horn of a bull and when the bull shifts it to the other horn, an earthquake takes place. How could it be true?

2

(a)

Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain.

3

(a)

Explain how does lightning conductor protect a building from getting struck by lightning.

3

(a)

You might have observed on a dry day that when you touch the screen of a television or computer monitor (with picture tube), you get a slight shock. Why does it happen?

3

(a)

It is safer to use a wireless telephone rather than using a land line telephone during lightning. Explain the statement with the help of a reason.

3

(a)

Explain how do the buildings can be designed and constructed in seismic zones.

3

(a)

Priya went to the school with umbrella on rainy season. One day, while returning from the school the rain started on the way. Priya opened her umbrella and saved himself from rainwater. After some time, she observed some lightning sparks in the sky. Sudden, she folded her umbrella and went to a shelter under a closed building.
(a) State the cause of lightning.
(b) Priya folded her umbrella. Explain why.
(c) Mention the method opted by Priya here.

5

(a)

If the metal clip used in the electroscope is replaced by an ebonite rod and a charged body is brought in contact with it, will there be any effect on the aluminium strips? Explain.

5

(a)